CVE-2023-2236

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation.

Both io_install_fixed_file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability.

We recommend upgrading past commit 9d94c04c0db024922e886c9fd429659f22f48ea4.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
Linux	Linux Kernel	>= 5.19, < 6.1

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4Exploit, Mailing List, Patch
https://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4Exploit, Patch
https://security.netapp.com/advisory/ntap-20230601-0010/Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4Exploit, Mailing List, Patch
https://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4Exploit, Patch
https://security.netapp.com/advisory/ntap-20230601-0010/Vendor Advisory

Timeline

Published: May 1, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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